<?php
// +----------------------------------------------------------------------
// | ThinkPHP
// +----------------------------------------------------------------------
// | Copyright (c) 2008 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id$

function browserCacheCheck() {
	if($_SERVER['REQUEST_METHOD'] == 'GET') {
		C('LIMIT_REFLESH_TIMES',10);
		//	启用页面防刷新机制
		$guid	=	md5($_SERVER['PHP_SELF']);
		// 检查页面刷新间隔
		if(Cookie::is_set('_last_visit_time_'.$guid) && Cookie::get('_last_visit_time_'.$guid)>time()-C('LIMIT_REFLESH_TIMES')) {
			// 页面刷新读取浏览器缓存
			header('HTTP/1.1 304 Not Modified');
			exit;
		}else{
			// 缓存当前地址访问时间
			Cookie::set('_last_visit_time_'.$guid, $_SERVER['REQUEST_TIME'],$_SERVER['REQUEST_TIME']+3600);
			//header('Last-Modified:'.(date('D,d M Y H:i:s',$_SERVER['REQUEST_TIME']-C('LIMIT_REFLESH_TIMES'))).' GMT');
		}
	}
}
Tag::add('app_init','browserCacheCheck');
?>